The appropriate variables for the row and column headings of the table are:
Troop number and activity preference.
In this setup, the troop number can be used as the row headings (e.g., Troop 1, Troop 2), and the activity preference can be used as the column headings (e.g., Hiking, Swimming). This structure allows for a clear display of how many members from each troop prefer each activity.